Steam-generator.



-PATENTED DEC. 24. 1907.

T. R. BUTMAN. STEAM GENERATOR. APPLIIOATION FILED nnq. 10,1906.

2 SEBETS-BEEET 1.'

i rL

PATENTED DEG. 24. 1907.

T. R. BUTMAN. STEAM GENERATOR.

APPLIOATIOH FILED DEU. ;0,1906.

2 aman-sum 2.

na: NORRIS paren: co.. wsma'av. p. c.

'taken in eonjunction with the accomp anying TILOMAS RICED BUTMAN, OFLAKE BLUFF, ILLINOIS.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed December 10. 1906. Serial No. 34.7.16 1.

To all whom 'it may concern:

Be it known that I, THOMAS REED BUT- MAN, a citizen of the UnitedStates, residing at Lako Bluil', in the County of Lake and State oflllinois, have invented certain new and useful lmprovements inSteam-Generators, of which 'the following is a specification.

My invention'relatcs to improvements in steam generators, and has forits primary object to provide a steam generator peculiarly adapted forinstallation in areas having a small vertical dimension, as in cellarsof buildings and. like environments.

A further object of my invention is to provide a steam generator of thegeneral character described, which will be efiicient, durable, easy ofinstallation, maintenance and repair, and embody other qualities ofpractical advantage.

Other and further objects of my invention will best become apparent tothose slrilled in the art from the following description,

drawings, wherein Figure 1 is a pair of boilers constitutng a battery,one boiler being shown in elevation and the other in section. Fig. 2 isa central, longitudinal section through the boiler setting, showing theboiler practically in elevation. Fig. 3 is a sectional detail throughthe shell, showing in elevation the shell supporting saddle.

Throughout the drawings like numerals of reference refer always to likeparts.

In said drawings 5 indicates a saddle whereon is mounted and supported ahorizontal boiler shell 6 of suitable length wherethrough take thelongitudinal fire tubes 7--7 opening as usual through the heads S and8', aswill be well understood, said tubes being in general conined tothe lower area or segment of the shell. From the 'upper portion of thehead 8 projects horizontally a drum or drums, the structure hereinspecifically shown involving three drums 9, Q and 9 of substantiallyuniform length, considerably in eXcess of the shell 6, but preferably ofdifferent diameters, the drum 9 being preferably larger than the drums 9and 9 which are preferably of equal size.

I prefer that the arrangementof the drums should be generally pyramidal,as best shown in Fig. 1, that is to say, with the largest drum 9elevated somewhat above and disposed between the smaller drums Q and 9and separated therefrom to pernit circulal tion of hot gases between theseveral drums, there being adjacent the free ends of the drums watertubes or connections, 10 and 10, connecting the drums Q and 9 with theupper larger drum 9, for circulation of water from one drum to another.The front or free ends of the drum are preferably guided and positionedin a plate, or metallic boiler front 11, covering the front wall 12 ofthe structure, wherethrough are made the usual apertures closable byfire doors 13 and. ash pit doors 14.

1.6 indicates a grate disposed beneath the front end of the drums, therebeing provided at the rear of the grate the usual bridge wall 17 as apart of the furnace structure.

I prefer that the parts be so proportioned that the bridge wall 17 ofthe furnace structure is separated from the head 8 of the shell 6, by adistance substantially equal to or slightly greater than the length ofthe tubes 7, so that the tubes 7 may readily be drawn out into the saidspace (indicated by numeral 18) for substitution of new tubes andrepairs when necessary. I further prefer that' the arrangement of thesaddle 5,' relative to the supported structure, be such that it isapproXimately beneath the center of gravity of the structure to besupported, so that the weight of the entire metallic structure islargely carried thereby and 'substantially all crushing strain is takenfrom the wall 12 and boiler front plate 11. Thus the free ends of thedrums may move in obedience to expansion and contraction without injuryto themselves or the said wall 12 and front 11.

In like manner a head wall 19, traversing the structure and surroundingthe shell 6 to cut off the combustion chamber 18, from communicationwith the eduction flue or uptake, is relieved of practically alll strainby the saddle arrangement. The side walls of the battery setting areindicated at 20, and from said side walls to the adjacent drums 9 andbetween the various drums 9 of the unit of the battery are arrangedbridge arches 21-21 of any suitable Construction. Thus all the surfacesof drums 9 and 9 will be eXposed to the heated area, while only thelower surfaces of the drums 9 will be directly exposed.

At their rear ends the tubes 7 of shell 6 open in'to an eduction, ortakeup, fiue 22, into which, preferably, opens from without thestructure the cleaning door 23. 24 indicates the blow-ofi pipecommunicating with the bottom of the shell 6, and 25 indicates the drysteam pipe, of usual Construction, entering the steam space at the topof the boiler, and above the water line.

In use the generator is kept with its water line at about such a levelas will maintain the drum 9 half full, so that each unit of the boilerbattery provides a very extended steam generating water surface, and alarge steam area from which the steam may be taken in a relatively drycondition through the dry pipe 25.

The heat from the furnace 16 impinges directly upon the forward endportions of the drums 9, 9 and 9 which, being of relatively smalldiameter may be made of relatively thin material and are not liable todeteriorate rapidly from the effect of expansion and contraction.Manifestly the hot gases of combustion flow rearwardly over the top ofthe bridge wall around and between the drums Q and 9 and the lower partof drum 9, and through the combustion space 18, to the shell 6, throughthe fire tubes 7, whereby the gases escape to the uptake 22. Thus thelarge shell 6, of necessity constituted of relatively thick material, isnot exteriorly subjected to a high degree of heat, and is thus preservedfrom rapid deterioration.

While I have herein described, in some detail, a specific embodiment ofmy invention, which I believe to have many advantages in its details, itwill be apparent that in its broader asfpect my invention is not limitedto the speci c construction shown and described, and that numerousmodifications might be made in the structure without departure from thespirit and scope of my invention.

Having thus described my invention, what I claim and desire to secure byLetters Patent, of the United States, is.

1'. In a steam generator, a shell, fire tubes taking longitudnallythrough a portion of the shell, a longitudnal drum communicat ing withthe shell, and a gratestructure beneath the drum spaced from the shell adistance substantially as great as the length of the tubes of the shell.

2. In a steam generator, a shell, fire tubes taking longitudnallythrough a portion of the shell, a longitudinal drum communicating withthe shell, a front support for positioning the free end of the drumwithout substantially restraining its freedom for lon itudinal movement,and a saddle dispose beneath the shell for substantially supporting theshell and drum.

3. In a steam generator, a shell, fire tubes taking longitudinallythrough a portion of the shell, a longitudinal drum communicating Withthe she a front' wall for positionng the free en'd of the drum withoutsubstantially retarding its freedom for longitudinal movement, and asaddle disposed beneath the structure substantially below its center ofgravity for supporting the shell and drum;

4:. In a steam generator, a series of parallel, relatively thin metaldrums, water connections between said drums near one end, a shell ofrelatively thick metal of greater cross sectional area than the combinedcross sectional areas of the drums, wherewith said drums connect to openfreely into the upper part thereof, fire tubes extending through thelower portion of the said shell, and a grate beneath the drums.

5. In a steam generator, a shell, fire tubes taking longitudinallythrough the lower portion of the shell, a plurality of drums projectingfrom and communicating with said shell, one of said drums being arrangedpart above and part below the calculated water line, and another whollybelow the water line, separated from' the first for heat eirculationtherebetween, water circulation connections be-' tween said drums, agrate below the drums, and means for directing the heat from the grateto the fire tubes throu h a path including the water filled parts o' thedrums and excluding the part of the drum above the water line.

6. In a steam generator, a shell, fire tubes taking longitudinallythrough the lower portion of the shell, three drums disposed inpyramidal relation, projecting longitudinally from and communicatingwith the upper portion of said horizontal shell, said drums being spacedapart to permit of circulation of the heating medium therebetween,'water circulation connections between the lower drums and the upperdrum and a grate beneath the forward portion of the drums.

7. In asteam generator, a horizontally disposed, relatively large shell,fire tubes taking ongitudinally through the lower portion of the shell,three horizontally disposed drums projecting longitudinally from andcommunicatin with the upper portion of said horizontal s ell, said drumsbeing arranged in pyramidal relation, the u per drum being of greaterdiameter than the lower drums, water circulation connection between thelower drums and the upper drum, a grate 'beneath the drums, and meansfor confining the heat of said grate to the lower portion of the upper`drum.

' In testimony whereof I hereunto set my hand in the presence of twowitnesses.

THOMAS REED BUTMAN.

